Act as a master worldbuilder with expertise in dark fantasy and speculative lore. Craft a detailed setting where the deceased are encased in luminous, sentient crystals that retain their memories and emotions. Describe the societal, cultural, and metaphysical implications of this practice. Include: [THE RITUAL OF CRYSTALLIZATION], [THE HIERARCHY OF THE CRYSTAL DEAD], and [THE SECRETS BURIED IN THE NECROPOLIS]. How do the living interact with these crystalline remnants? Are the crystals revered, feared, or exploited? What happens when a crystal shatters or goes dark? Build a rich, immersive world where death is not an end but a transformation into something hauntingly beautiful yet perilous.